使用髋部佩戴式加速度计评估老年人的步行强度。
Evaluating Walking Intensity with Hip-Worn Accelerometers in Elders.
作者信息
Corbett Duane B, Valiani Vincenzo, Knaggs Jeffrey D, Manini Todd M
机构信息
Department of Aging and Geriatric Research, Institute on Aging, University of Florida, Gainesville, FL.
出版信息
Med Sci Sports Exerc. 2016 Nov;48(11):2216-2221. doi: 10.1249/MSS.0000000000001018.
PURPOSE
Accelerometer activity counts are used to objectively categorize physical activity levels. We examined the association between accelerometer activity counts and metabolic effort in older adults.
METHODS
Forty-five older adults (76.3 ± 5.1 yr) completed a 400-m walk at both a usual and a rapid pace. A portable metabolic unit measured pulmonary gas exchange, whereas a hip-worn accelerometer measured activity counts. Participants were categorized as either a "slow walker" or a "fast walker" based on the threshold of 1.0 m·s during usual-pace walking.
RESULTS
Activity counts during rapid (r = 0.62, P < 0.01) but not usual-pace (r = 0.24, P = 0.11) walking were significantly associated with METs. Slow walkers attained only half the activity counts of fast walkers during each walk condition (P < 0.01), while at the same time achieving between 82% and 90% of their MET level.
CONCLUSION
Accelerometers may misclassify the activity level of functionally impaired older adults with slow walking speed.
目的
加速度计活动计数用于客观地对身体活动水平进行分类。我们研究了加速度计活动计数与老年人代谢努力之间的关联。
方法
45名老年人（76.3±5.1岁）以平常速度和快速完成了400米步行。一个便携式代谢单元测量肺气体交换，而一个佩戴在髋部的加速度计测量活动计数。根据平常速度步行时1.0米/秒的阈值，参与者被分类为“慢行者”或“快行者”。
结果
快速步行（r = 0.62，P < 0.01）而非平常速度步行（r = 0.24，P = 0.11）时的活动计数与代谢当量显著相关。在每种步行条件下，慢行者的活动计数仅为快行者的一半（P < 0.01），而同时达到其代谢当量水平的82%至90%。
结论
加速度计可能会错误分类步行速度慢的功能受损老年人的活动水平。
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